crm_attribute: Default --lifetime to forever when using --node

None of the examples using --node in the help text will succeed
since read_attr_delegate() is passed NULL as section and fails
on an assertion. section should be set using --lifetime to either
"reboot" or "forever". This patch makes --lifetime default to
"forever" if the value was not set explicitly.
Log: attrd: Reduce log severity for normal messages
Log: corosync: Reduce log severity for a redundant message

The similar message will be logged in get_node_name()
Low: crm_get_msec: prevent integer overflow

Before, for instance (unlikely): 9223372036854775807s -> -1000

Signed-off-by: Jan Pokorný <jpokorny@redhat.com>
Refactor: xml: Split up the RelaxNG schema files so they're easier to version individually
Feature: xml: Add the ability to have lightweight schema revisions
Refactor: xml: Generate the 1.0 schema too
Doc: xml: More information about schema versioning
Refactor: xml: Work out more schema details automatically
Fix: xml: best-match.sh helper needs to be included in make dist
Refactor: xml: Autogenerate versions.rng based on RNG_versions in the makefile
Refactor: xml: Replace CRM_DTD_VERSION with a function that returns the relevant known_schemas entry
Clone the latest resources schema in preparation for changes
Feature: xml: Support resources that require unfencing
Doc: xml: More details on schema versioning
Build: xml: Autodetect the available schema versions
Fix: xml: Return an actual string from xml_latest_schema() as advertised
Build: xml: tell make to build versions.rng
Fix: xml: Build a valid schema for versions.rng
Test: tools: Ingore changes to validate-with in regression tests